Dirty dot in lightning bolt icon is still showing even after html changes in a document are completely undone.

[RaymondLim]

1. Open an html page.
2. Click on lightning bolt icon to live preview the page in Chrome.
3. Make a change in the document. Both document title and lightning bolt icon show the dirty dot.
4. Press Ctrl/Cmd-Z to undo all the changes.

Result: Dirty dot in the title is removed, but lightning bolt still shows the dirty dot.

[njx]

FBNC to @RaymondLim (but since you fixed it, you can probably just close it :))

[RaymondLim]

Fix verified.